Trouble debugging single URL

I'm having trouble debugging this URL: `http://www.theverge.com/2013/2/28/4038892/what-chrome-extensions-do-you-use-and-other-tweaks-tips-and-tricks`

If I adjust the `simple.js` example to use this URL, like so:

``` js
var readability = require('../src/readability')
  , fs = require('fs')

// uncoment the following line to print the debug info to console.
// readability.debug(true);


readability.read('http://www.theverge.com/2013/3/17/4113714/60-minutes-jack-dorsey-profile-on-cbs-tonight',
function(err, read) {
  var dom = read.getDocument();
  var html = '<html><head><meta charset="utf-8"><title>'+dom.title+'</title></head><body><h1>'+read.getTitle()+'</h1>'+read.getContent()+'</body></html>';
  console.log(html);
});
```

I get the following error:
```
/Users/Oliver/Development/Temp/node-readability/examples/simple.js:10
  var dom = read.getDocument();
                 ^
TypeError: Cannot call method 'getDocument' of undefined
    at /Users/Oliver/Development/Temp/node-readability/examples/simple.js:10:18
    at jsdom.env.done (/Users/Oliver/Development/Temp/node-readability/src/readability.js:100:11)
    at exports.env.exports.jsdom.env.scriptComplete (/Users/Oliver/Development/Temp/node-readability/node_modules/jsdom/lib/jsdom.js:205:39)
    at process.startup.processNextTick.process._tickCallback (node.js:244:9)
```

If I use any other URL from this website, it seems to work fine however.